Now I am really stumped as well. The codes changed to 172 and 175 which are basically the same codes with the same problems but rich instead of lean. But why would they change? I started with 1132 and 1152, fixed those then got 171 and 174, and after changing all the vacuum lines (or almost all of them) the codes change to 172 and 175. I don't get it now for crap

 

HI!... Well JMC and I did a compression test and all the cylinders are at 155-160PSI except #5 which is only 90-100PSI. Way to go SEIFKERS!!!!! %%$#%^^&$^$^ (engine builder). That was one of the pistons that they changed after the 1st engine buildup blew. Did a wet test and it came up a bit better so the rings are already going in #5. Looks like the turbo money for this winter is going into another 5.4 rebuild. This will be 4 in one year. This time I'll be going out of town to get the engine built. The engine builders here don't know *****T.

Anyway JMC and I took off the D/S valve cover to make sure there wasn't a broken valve spring or something. Bumped it over a few times. Everything seems in order. We tried running my stock MAF sensor in my LIGHTNING MAF housing that I have on the truck. Trucks idle smoother out quite a bit but still seemed like it was missing. Talked to my dyno guy and he knows a few guys with stocl LIGHTNING mafs so he's going to see if he can borrow one to see if my LIGHTNING 90MM maf sensor has gone bad. If that doesn't fix the problem then he's going to data log the truck and see what it's doing.

 

HOLY FRANK!! They should stand behind there work?!?!! I would have came unglued for as many times as their build has!!!

That sucks..


Good Luck

 

HI!... Well the truck still won't run worth a crap!!!!

So far this is what JMC and I have checked and are fine.

- changed fuel filter
- put in fresh gas in tank (mabey bad gas?)
- checked coil packs
- checked spark plugs
- checked EGR
- replaced MAF
- changed computer tune
- cleaned 42LB injectors
- changed 02 sensors
- checked crank sensor
- checker cam sensor
- tore down my AEROMOTIVE FPR
- checked EVAP system
- checked all vacuum lines
- checked PCV system
- no leaks around intake or intake manifold

Now tonight we noticed that when the truck is idling really rough at idle that the fuel pressure is at 31-31PSI like normal. But as soon as I started to slowly press on the gas the fuel pressure drops down to 22-24PSI. It has always climbed not decreased. Now if we pull the vacuum line off the adjustable FPR fuel pressure jumps to 42PSI and drops about 2-3PSI when barely touching the gas.

Now does this seem like a fuel pump problem? I have a WALBRO 190LPH in tank pump. I installed it about 5 years ago. Could it be that I'm getting the fuel pressure sort of but no volume????

JMC has a new 255 WALBRO pump that I can buy and install in my tank if it is the fuel pump.

 

Neal, what happens when the fuel pressure goes down?
Do you not go lean?
What are the codes telling ?
With 42 lb injectors at 40 psi, you need a min. of 200 l/h pump as a normal requirment in any event.
Can't feed a motor like that on 25 psi.

 

+1 that sounds about right

 

Yeah Neal id swap in a 255 walbro. Im running the 190 and I think with much more power, it wouldnt be enough. But with my new engine, a bosch 325lph will be plenty

 

HI!... Well MIKE T told me the WALBRO 190LPH pump will support up to 450RWH.P in a N/A application, and according to my datalogging I was no where near maxing the pump out. Jmc and I installed a new WALBRO 255 pump he had and a different pump screen and it still runs like crap!!!!! We tried different fuel injectors and a whole new set of coil packs and it still runs like crap!!!!!! I'm getting ready to set this dam thing on fire!!!!!!! I'm serious......................

 

hmm... you said you still have very low compression on #5... maybe thats why?

 

HI!... That doesn't explain why I'm dropping cylinders all over the engine though. JMC now thinks it's electrical. I'm just getting fed up with this thing right now. While cruising for parts today JMC and I stopped at a dealership to look at a 2002 FORD RANGER. It was exactly everything I wanted until I saw it had the ***** 3.0L v-6 in it. I will only take a 4.0L SOHC. If it would of been a 4.0L I would now be driving it.

I've been working on this dam truck for about 10 hours a day this whole weekend and about 3-5 hours after work since last tuesday. I'm about ready to park it permanently...............

 

That really sux. I wasnt going to mention the electrical problem, but something is really wrong, and its probably simple, just hard as he** to find.

 

try going to the accel COP's since the GMS's gave u so much hell. but id pull the heads or bore scope the dead cylnder

 

HI!... Well I believe a compression ring broke that's why I have hardly no compression in #5. A buddy brought over a different scanner tonight and it says that the PCM has shut down #5's coil due to it senses no compression in that cylinder. So that explains my misfire. So once again, the engines coming apart and going to sit for a while. I'M BUYING ANOTHER TRUCK!!!!!!!!!!!!!

 

Your not quitting are ya? Did you say your running 8.5/1 compression? I have the same pistons and rods in my project engine, so would i have 8.5/1 also?

 

yes if the dish of the piston is the same.